Method of driving image display apparatus
a technology of image display and drive mechanism, which is applied in the direction of electric digital data processing, instruments, computing, etc., can solve the problems of brightness fluctuation, and achieve the effect of reducing the amount of current, preventing a large current, and improving the contrast ratio of the image display apparatus
Active Publication Date: 2009-12-31
LG DISPLAY CO LTD
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Benefits of technology
The present invention provides a method of driving an image display apparatus that improves the contrast ratio in a simple manner. The method involves feeding the pixel circuits with an image signal corresponding to light emission luminance of the light emitting unit, applying a reverse bias voltage to the light emitting unit, and causing the light emitting unit to emit light based on the image signal. This prevents a large current from flowing through the light emitting unit at the initial stage of the light emission period, reducing the amount of current flowing through the light emitting unit that is emitting light at a low gray level. As a result, the contrast ratio of the image display apparatus is improved.
Problems solved by technology
For example, an active matrix image display apparatus with a plurality of pixels, each having a light emitting device connected in series with a driving transistor such as TFT, suffers from brightness fluctuations due to changes in current flowing through the light emitting device.
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[0043]Exemplary embodiments of a method of driving an image display apparatus according to the present invention are described in detail with reference to the accompanying drawings. It is to be understood that the present invention is not limited to the embodiments described below.
[0044]FIG. 1 is a diagram showing a configuration of a pixel circuit corresponding to one pixel of an image display apparatus for describing a first embodiment of the present invention. Pixel circuits as shown in FIG. 1 are arranged in matrix. The pixel circuits each includes an organic light emitting device OLED, i.e., one of the organic EL devices, a driving transistor Td, a threshold voltage detecting transistor Tth, and switching transistors Ts and Tm. The switching transistor Ts and Tm connects a capacitance Cs to a predetermined line for a predetermined period of time. The capacitance Cs holds a threshold voltage and an image signal potential. FIG. 1 depicts only a general configuration of a pixel ci...
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A method of driving an image display apparatus that includes a plurality of pixel circuits each provided with an organic light emitting device and a driving transistor that is electrically connected to the organic light emitting device and controls light emission of the organic light emitting device, includes: feeding the pixel circuits with an image signal corresponding to light emission luminance of the organic light emitting device; applying a reverse bias voltage to the organic light emitting device; and causing the organic light emitting device to emit light based on the image signal.
Description
TECHNICAL FIELD[0001]The present invention relates to a method of driving an image display apparatus.BACKGROUND ART[0002]Image display apparatuses have been proposed that use a current-control type organic EL (Electroluminescent) device having a function of emitting light through the recombination of electrons and positive holes injected into the light emitting layer.[0003]In an image display apparatus of this type, each pixel includes a thin film transistor (TFT) which is formed of, for example, amorphous silicon or polycrystalline silicon, and an organic light emitting diode (OLED), which is one of the organic EL devices. The brightness of the pixel is controlled by setting its current to an appropriate value.[0004]For example, an active matrix image display apparatus with a plurality of pixels, each having a light emitting device connected in series with a driving transistor such as TFT, suffers from brightness fluctuations due to changes in current flowing through the light emit...
Claims
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IPC IPC(8): G06F3/038
CPCG09G3/3233G09G2320/0238G09G2320/0233G09G2300/0819G09G3/30G09G3/20
Inventor TAKASUGI, SHINJI
Owner LG DISPLAY CO LTD